. Electro-physiology. Electrophysiology. 380 ELECTRO-PHYSIOLOGY CHAP. apparent contradiction, while du Bois-Beymond (whose inter- pretation of the negative variation in the muscle current will be discussed below) finds himself reduced to the highly improbable assumption that the natural, uninjured ends of fibres, or parelectronomic layer of the same, take little or no part in the excitatory process. Against this, it must be remarked in the first place that a tetanic action current in the same direction may always be observed when the ends of fibres are not included in the leading-off tract, an
. Electro-physiology. Electrophysiology. 380 ELECTRO-PHYSIOLOGY CHAP. apparent contradiction, while du Bois-Beymond (whose inter- pretation of the negative variation in the muscle current will be discussed below) finds himself reduced to the highly improbable assumption that the natural, uninjured ends of fibres, or parelectronomic layer of the same, take little or no part in the excitatory process. Against this, it must be remarked in the first place that a tetanic action current in the same direction may always be observed when the ends of fibres are not included in the leading-off tract, any two points in the longitudinal surface of the muscle being taken as the contacts of the leading-off. M FIG. 120.—Schema of the diphasic action current. (Bernstein.) circuit (Hermann, 27). The cause of this may be determined by an experiment first carried out by Bernstein ( p. ff.) with the aid of the rheotome; it is also valuable in other connections. Let (M, M} be a regular muscle with parallel fibres, at one end of which single stimuli are led in at equal intervals by the rheotome (Fig. 120), while between every two excitations there is a very brief closure of the galvanometer circuit at any con- venient moment of the pause between the excitations; then—if excitation and galvanometer closure occur simultaneously—no result can follow, since the wave of excitation, starting from (P), requires a certain time to reach the nearest leading-off point (a). But if the galvanometer circuit is always closed at. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Biedermann, W. (Wilhelm), 1852-1929; Welby, Frances A. (Frances Alice). London : Macmillan
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